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jsspace 发表于 2014-7-2 10:56
( S3 U7 ^' \5 w% w9 v& D2 T+ }1 e次级不能接地,这个在61347-2-13上已经明确说明了
, e$ t- }7 E6 L* x8 b$ K依据IEC61347-2-13 Clause 8.2, 满足条件的SELV都可以被人接触到,为什么不可以接地? f' o1 I5 b8 y& b- ^
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8.2 Output circuits of SELV- or SELV equivalent control gear may have exposed terminals if
7 M M# r- z, B: f$ r% _– the rated output voltage for constant voltage control gear or maximum output voltage for
. {6 F/ B1 M7 Q/ Q8 T7 {# xconstant current control gear under load does not exceed 25 V r.m.s.;
o% U8 }# D* y# @– the no-load output voltage does not exceed 33 V r.m.s. and the peak does not exceed0 w3 G. _5 `2 p& e9 c
33 2 V.8 I/ j" u; u$ n$ `: R+ [8 S+ {
Compliance is checked by measuring the output voltage when steady conditions are
4 q* k9 F$ u' i6 n2 z/ f7 Qestablished, the controlgear being connected to rated supply voltage and rated frequency. For+ u) a" } G1 i5 z& B* |" [( l
the test under load, the controlgear is loaded with a resistance which would give rated output
; o1 |6 z: e2 |, e( x* }at rated output voltage.. p8 e1 z: b* Z; G: q2 m& w2 G
For controlgear with more than one rated supply voltage, the requirement is applicable for6 n. Q" i L' @
each of the rated supply voltages.7 n7 X% H5 v2 X+ f! d( x2 a, R
Controlgear with a rated output voltage above 25 V shall have insulated terminals. |
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